Wolff, L., & Spencer, G. (1966). The world of nature, the story of living things. The Grolier Society.
Chicago Style (17th ed.) CitationWolff, Leslie, and Geoffrey Spencer. The World of Nature, the Story of Living Things. The Grolier Society, 1966.
MLA (8th ed.) CitationWolff, Leslie, and Geoffrey Spencer. The World of Nature, the Story of Living Things. The Grolier Society, 1966.
Warning: These citations may not always be 100% accurate.